Step-by-step transmitter



Janfl24, 1933.

w. F. CASSEDY, JR

STEP-BY-STEP TRANSMITTER Filed March 7. 1931 INVENTOR WILLIAM F. CASSEDY JR.

RY @ITORNZ Patented Jan. 24, 1933 UNITED STATES PATENT OFFICE,

WILLIAM F. GASSEDY, JR., OF MILIBURN, NEW JERSEY, ASSIGNOR TO INTERNATIONAL COMMUNICATIONS LABORATORIES, INC., OF NEW YORK, N. Y., A CORPORATION OF 7 NEW YORK STEP-BY-STEP TRANSMITTER Application filed March 7, 1931.

My invention relates to step-by-step transmitters and particularly to the type used in telegraphy and cable work wherein a perforated tape is used for carrylng contacts to transmit the proper signals or message.

eration of the mechanism is dependent upon the return or de-energi'zing stroke of the electro-magnet.

Other features of my invention will be pointed out in the following description.

Referring to the drawing, 1 have illustrated the essential features of the mechanism embodying my invention.

The electro-magnet 1 is provided with an armature 2 attached to the arm 3 whlch is provided with the bearing or p vot 4. p

The opposite end of the arm 3 is provided with a pawl 6 having a pivot or bearing 7.

The winding of the electro-magnet 1 is included in a circuit including a key 70, a rowtating commutator or interru ter 71 and a source of current supply 72. Vhen the key 7 O is closed, the circuit through magnet l is completed and it is intermittently operated by the commutator 71.

' Therpawl 6 engages the teeth of thetwo ratchet wheels 10 and 20. The wheel ;an d

the feed wheel'40 are mounted upon the,

shaft 42cand rotate therewith. The wheel 10 is loosely mounted upon shaft 42 but rotates freely upon it without causing the rotation of the shaft.

Associated with the wheel 10 is a cam wheel also loosely mounted upon'the shaft 42. The wheel 30 is, however, attached or coupled to the wheel 10 and rotates with it.

The periphery of the feed wheel'40 is proserial No. 520,857.

vided with teeth 41 which engage perforations in the tape 80 to cause its advance.

The jockey arm 23, mounted loosely upon the shaft 37 is provided with a portion 25 which engages the teeth of the wheel 20. This jockey arm is provided with the pin 24 which engages the link 33.

This link is likewise loosely mounted upon the shaft 37 and is provided with a roller 34 having a bearing at 35.

This roller engages the raised portions 32 and the recessed portions 31 of the cam wheel 30. WVhen the roller engages the raised :por-

tions, the arm 61, attached to the link 33 and 55, respectively, are the pecker rods 44 and -54.

The ends of these rods are arranged to engage perforations in the tape 80.

The ratchet wheel 20 is provided with more teeth than wheel 10; for instance, the wheel 20 is provided with twelve teeth and'wheel 10 with nine. l/Vhen the pawl 6 starts its movement, it first engages a tooth in wheel lOand then engages a tooth in wheel 20.

The operation of the device is as follows:

The tape which is provided with two rows of perforations (in addition to those en.- gaged by the feed wheel 40), which correspond to the code or message to be transmitted, is attached to the device.

The operator by closing switch 70 closes an intermittent circuit through magnet 1, which in turn intermittently attracts the armature 2 and operates the arm 3.

The operation of this arm upon the energizing stroke causes the pawl 6 to first engage a tooth in the wheel 10, causing it and the cam wheel 30 to start rotating.

The wheel 30, in moving, causes a raised portion 32 to engage roller 34, thus forcing down the arm 33, carrying the rod 61.

The rod 61 engaging the bell crank arms 43 and 33 causes the pecker rods to be drawn down from engagement with forations in the tape.

As the pawl 6 further advances it engages a the tape or per tooth in wheel 20, causing the feed wheel 40 to rotate and advance the tape 80. The jockey arm 23 immediately starts downward with the movement of the tape and the pin 24 engages the link 33 and prevents it from rising. When the portion of the arm 23 drops into the notch of the tooth of wheel 20, which will be when the feed of the tape is.

: 205 fluence of the tension spring 5.

In order to transmit impulses according to the perforations in, the tape engaged by thepecker rods and 41, a set of controlling contacts are arranged to be ope-rated by each 2.5"; rod.

, The lower end of vided with a contact spring 46 and a co-operating contact 47, while the bell crank 53 is provided with a contact spring 56 and a cooperating contact 57 Whenthe pecker rods are not engaging perforations in the tape, the contacts which they control are separated, but wheneither pecker rod engages a perforation, its controlling contact is closed.

It has been explained how the pecker rods engage perforations on the forward or energizing stroke of the arm 3 controlled by the magnet 1. These rods remain in engagement and their respective controlling contactsremagnet and until the next forward stroke.

This insures a long contact time and produces signals or impulses of a maximum length. While I have shown the pawl 6 intermittently operatediby an electro-magnet, any other form of intermittent means for operation maybe employed. 7 What is claimed is: V

1. In a step-by-step transmitter, the combination of a-perforated tape and a feed wheel therefor, a ratchet wheel and a cam wheel, an intermittently operated electromagnet common to and for operating said ratchet and cam wheel, a pecker rod for engaging saidtape, the operation'of said cam wheel first causing said rod to disengage said tape, the operation of said ratchet wheel then causing the operation of said feed wheel to advance said tape and afterward to permit said rod to again engage perforations in saidtape.. v I p 2. In a step-by-step transmitter, the combination of a tape and a pecker rod nor mally engaging said tape, an electro-magnet, means for energizing and de -energizing said the bell crank 43 is properforations in said tape. I

l 5. In a step-by-step transmitter, the com-v bination of a perforated tape and anelectromain closed after the tie-energization of the electro-magnet, and means controlled by said electro-magnet upon its energization and before its de-energization to cause said pecker rod to first disengage said tape, then to advance said tape and afterward permit the Y pecker rod toagain engage said tape. 7

3. In a step-by-step transmitter, the combination of a perforated tape and a feed wheel therefor, a cam wheel, an intermitand afterward permitthe pecker rod to seek.

other perforations in said. tape.

4. In a step-by-step transmitter, the combination of a perforated tape and a feed wheel therefor, an intermittentlyYoperated electro-magnet for operating said wheel, a

pecker rod for engaging the perforations in said tape, meanscontrolled by said electromagnet for first causing said pecker rod to disengage perforations in said tape the Open ation of said wheel then causing said tapeto advance and after the completionof the advance permitting the pecker rod to seek other magnet, means for energizing and'de-energizing said electro-magnet, a pecker rod for engaging the perforations in said tape, means controlled by said electro-magnet upon its energization and before its de-energization to first cause the pecker rod'to disengage a perforation in said tape, then to operate said tape and afterward permit the pecker rod to seek another perforation in said tape.

- 6. In a step-by-step transmitter, the combination of a perforated tape and an electromagnet, means for energizing and de-energizing said electro-magnet, a pecker rod for engaging the perforations in said tape, means,

controlled by said electro-magnet upon its energization and before its de-energi'zation to first cause the pecker rod to disengage a perforation in said tape, then'to operate said tape and afterward permit the pecker rod to seek another-perforation in said tape, aset of contacts, and means controlled by said pecker rod to controlsaid contacts depending upon its said tape.

7. In a transmitter, the combination of a perforated tape and a peckerrod normally engaging a perforation therein, means for impartin intermittent movement to said tape, an means controlled by. said intermittent means in a'single movement to first cause saidpecker rod to disengage the perforation in said tape, ,then' impartia' movement to said tape and afterward permitithe engagement with perforations in pecker rod to engage another perforation therein.

8. In a step-by-step transmitter, the combination of a perforated tape and an electromagnet, a pecker rod for engaging the perforations in said tape, means for imparting an energizing and de-energizing movement to said electro-magnet, means controlled by said electromagnet in one movement and before its other movement to first cause the pecker rod to disengage a perforation in said tape, then to operate said tape and afterward permit the pecker rod to seek another perforation in said tape.

9. In a transmitter, the combination of an electro-magnet, means for energizing and deenergizing said electromagnet, a set of contacts, means controlled by said electromagnet first upon energization to open said contacts, and additional means for then closing said contacts before de-energization of said electromagnet.

10. In a transmitter, the combination of an electromagnet, means for energizing and deenergizing said electromagnet, a set of contacts, means controlled by said electromagnet upon its energization to close said contacts, and additional means to maintain said contacts closed until the next energization of said electromagnet.

11. In a transmitter, the combination of an electromagnet, means for energizing and deenergizing said electromagnet, a set of contacts, means controlled by said electromagnet upon its energization and before its de-energization to open said contacts, and additional means to close said contacts and to maintain them closed during said de-energization of said electromagnet.

12. In a transmitter, the combination of an electromagnet and an arm therefor, means for energizing and de-energizing said electromagnet to cause the movement of said arm, a set of contacts, means controlled by the arm during its movement in one direction to open said contacts, and additional means to close said contacts and to maintain them closed during the movement of the arm in the opposite direction.

In Witness Whereof, I hereunto subscribe my name this 6th day of March 1931.

WILLIAM F. CASSEDY, JR. 

